CN202072574U

CN202072574U - Ammonium nitrate waste water processing unit

Info

Publication number: CN202072574U
Application number: CN2011201700474U
Authority: CN
Inventors: 武晋强; 李永鹏; 陈赵锁; 王玉平; 李剑川; 陈建温
Original assignee: TAIYUAN HAILIFENG TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: TAIYUAN HAILIFENG TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2011-05-25
Filing date: 2011-05-25
Publication date: 2011-12-14
Anticipated expiration: 2021-05-25

Abstract

The utility model relates to an ammonium nitrate waste water processing unit which adopts any one of the following schemes: evaporation equipment which has two effects or 6 effects to the maximum, or single-effect evaporation and recompression treatment equipment or evaporation equipment and recompression treatment equipment with 2 to 6 effects. The ammonium nitrate waste water processing unit utilizes partial secondary steam generated in ammonium nitrate production process and adopts an evaporation condensation method to optimize multiple-effect evaporation parameters and equipment structures, thereby enhancing processing efficiency and reducing energy consumption.

Description

A kind of treatment unit of ammonium nitrate wastewater

Technical field

The utility model relates to a kind of treatment unit of ammonium nitrate wastewater.

Background technology

As everyone knows, in the production of ammonium nitrate, especially in the high density nitric acid pressurization and technology, synthetic one ton of ammonium nitrate approximately produces 0.4 ton of the secondary steam that contains 0.4 ~ 1.0% free ammonia and 0.4 ~ 0.6% ammonium nitrate, and in the ammonium nitrate solution evaporating concentration process, produce relevant with ammonium nitrate concn total nitrogenous 0.4 ~ 0.8% evaporation condensate simultaneously, these two strands of materials finally form waste water main in the ammonium nitrate production behind a series of recyclings and Btu utilization.Common treatment process can't reach emission standard economical, efficiently, and most of factories adopt the dilution mode to efflux, and not only cause the loss of nitrogen, and a large amount of sewage cause water pollution.

Common ammonium nitrate wastewater is handled and is comprised methods such as stripping, film processing, ion-exchange and evaporative condenser, but the waste water after the gas stripping process of ammonium nitrate wastewater is handled still contains total nitrogen pollutant of 0.01 ~ 0.05%, can't implement further to cut down and recycling; Membrane processing method, though especially reverse osmosis can be reduced to the ammonium nitrate content in the waste water below 10 ppm and since produced the waste liquid that contains ammonium nitrate 1 ~ 3% of the water yield of handling about 25%, do not reach the requirement of direct recycling, and investment and maintenance cost height, and can't extensively adopt; What other treatment process had is technical not overripened, and what have maybe can't recycle the practical situation that all are not suitable for device because of the economic treatment amount is less than normal; And utilizing evaporative condenser method treatment of nitric acid ammonium waste water, it is applied and also has been subjected to certain restriction owing to high energy consumption.

The patent applicant handles the top-priority means that minimize with " system optimization " and " recirculation " as ammonium nitrate wastewater, be economical and efficient ground realization wastewater zero discharge truly, through being analysed in depth the back, Ammonium Nitrate finds, (as: CN86105683 and CN1182636 etc.) are along with the raising (0.35 ~ 0.45Mpa) of concentration of nitric acid (58 ~ 65%) and neutralization reaction pressure in modern Ammonium Nitrate, for reaching High-efficient Production and the solution concentration degree (96 ~ 99.7%) that satisfies the variant production requirement, the secondary steam that processing requirement produces in can only the part use and simultaneously must outer saturation steam for a certain amount of elevated pressures (0.8 ~ 1.5Mpa), neutralization reaction also needs the ammonium nitrate solution or the phlegma (13 ~ 45%) of a part of lower concentration lesser temps to return with control reaction temperature (185 ~ 195 ℃) under safety condition simultaneously.When like this secondary steam being used for the ammonium nitrate evaporating solns after the preheating vacuum flashing cooling still some secondary steam can be used for the evaporation heating of treatment unit for waste water waste water, be expected to reduce greatly and utilize evaporative condenser method treatment of nitric acid ammonium waste water system energy consumption; 15 ~ 35% the rare ammonium nitrate concentrated solution that produces in the wastewater treatment also can satisfy the safety control of temperature of reactor; Simultaneously, the waste water after the processing (15 ~ 30 ppm) can return in the nitric acid production technology, reaches the optimization of total system and energy-efficient.

Summary of the invention

The utility model aims to provide a kind of treatment unit of ammonium nitrate wastewater, this device utilizes the part secondary steam that produces in the Process of Ammonium Nitrate Production, adopts the evaporative condenser method, and multiple-effect evaporation parameter and device structure are optimized, improve processing efficiency, cut down the consumption of energy.

The utility model adopts following technical scheme:

A kind of treatment unit of ammonium nitrate wastewater is characterized in that: comprise in the following scheme any:

(a) contain at least 2 and imitate, can reach at most 6 evaporation equipments of imitating: this device comprises neutralization buffer groove, at least 2 evaporation equipment, condenser, the phlegma storage tanks of imitating that link to each other successively, and evaporation equipment comprises vaporizer, separator, recycle pump;

(b) single-effect evaporation recompression treatment facility: this device comprises neutralization buffer groove, single-effect evaporation equipment, mechanically compress treatment facility, the phlegma storage tank that links to each other successively, evaporation equipment comprises vaporizer, separator, recycle pump, and the mechanically compress treatment facility comprises the vapor recompression machine;

(c) contain 2 ~ 6 evaporation equipments of imitating and recompression treatment facility: this device comprises neutralization buffer groove, multifunctional evaporating equipment, mechanically compress treatment facility, the phlegma storage tank that links to each other successively, evaporation equipment comprises vaporizer, separator, recycle pump, and the mechanically compress treatment facility comprises the vapor recompression machine.

In such scheme, described vaporizer all adopts the falling film type evaporation mode.

In such scheme, described separator is equipped with non-moist fiber mist eliminator and controls entrainment with steam.

The treatment unit of the ammonium nitrate wastewater that the utility model provides, it is characterized in that treatment unit for waste water supplies under the condition of live steam outside not needing, according to utilizing secondary steam to select the effect number of multiple-effect evaporation, can reach 6 at most and imitate with needing treatment of nitric acid ammonium sewage quantity ratio; Secondary steam can reach 23% with needing treatment of nitric acid ammonium sewage quantity minimum rate; Secondary steam minimal pressure 1.4bar(abs) reclaims ammonium nitrate solution concentration the time and can reach 15 ~ 35%; Ammonium nitrate content has only 15 ~ 30 ppm in the waste water after the processing.

Its feature two is multi-effect evaporation system, can adopt following current or counter-current operation mode.

Its feature three be do not have can condition for secondary steam that utilizes or live steam expense costliness under, also available mechanically compress treatment system replaces multi-effect evaporation system, reclaims ammonium nitrate concn and reaches 15 ~ 20%; Or the last step of mechanically compress treatment system as multi-effect evaporation system be coupled, further improve its economy and handiness.

Its feature four is that evaporation equipment all adopts the falling film type evaporation mode in order to improve the secondary steam utilising efficiency.

Its feature five is that separating device all uses efficient mist eliminator to control the amount of the ammonium nitrate that enters evaporation condensate, and then reduces the internal circulating load of rare cone nitric acid ammonium liquid after the wastewater treatment.

Below in conjunction with drawings and Examples the utility model is described further.

Description of drawings

Fig. 1 utilizes part secondary steam two to imitate the evaporation technology schematic flow sheet.

Fig. 2 utilizes vapor recompression processing technological flow synoptic diagram.

Fig. 3 utilizes part secondary steam two to imitate evaporation to adopt machinery recompression flow process schematic flow sheet simultaneously.

Among the figure: 1 secondary steam phlegma, 2 secondary steams, 3 gas ammonias, 4 phlegma neutralization buffer grooves, 5 mixing condensation liquid pumps, 6 mixing condensation liquid, 7,19 1,2nd effect evaporator, 8,20 separators, 9,21 mist eliminators, 10,22 1, two imitate recycle pump, 11,23 1, two imitate circulation fluid, 12,14 1, two imitate flash steam, 13,24 1, two imitate concentrated solution, 15,25 traps, 16 have handled the phlegma storage tank, 17 condensate pump compressors, 18 have handled phlegma, 26 secondary steam phlegmas, 27 condensers, 28 water coolants, 29 injectors, 30 non-condensable gases, 31 phlegmas, 32 vapor recompression machines, 33 recompression steam, 34 is outer for steam (driving or standby), 35 evaporation condensates.

Embodiment

Embodiment 1:

Fig. 1 shows and utilizes part secondary steam two to imitate the evaporation technology schematic flow sheet, among the figure, the treatment unit of ammonium nitrate wastewater contains 2 evaporation equipments of imitating: this device comprises neutralization buffer groove 4,2 effect evaporation equipments, condenser 27, the phlegma storage tank 16 that links to each other successively, evaporation equipment comprises one, 2nd effect evaporator 7,19,, two is imitated

separators

8,20,, two and imitated recycle pumps 10,22, is equipped with non-moist fiber mist eliminator 9,21 in the

separator

8,20 and controls entrainment with steam.

Technological principle to this device is described in more detail in conjunction with the accompanying drawings: referring to Fig. 1, utilize part secondary steam two to imitate the evaporation technology schematic flow sheet, from the part secondary steam 2 of neutralization reaction, at first be collected in the phlegma neutralization buffer groove 4, deliver to multiple-effect evaporator 7,19 by in the gas ammonia 3 and back by condensate pump 5 and handle from the

secondary steam phlegma

1,26 and the evaporation condensate 35 of solution condensing device.The multiple-effect evaporation unit is made up of falling-film evaporator 7,19 with

circulation loop

11,23 and

vapor seperator

8,20 with fiber scum dredger 9,21, one effect is evaporated the secondary steam that adopts the generation of part neutralization reaction, and (0.35 ~ 0.45Mpa) as thermal source, and two effects are evaporated the steam that then adopts an effect evaporation generation, and (0.12 ~ 0.15Mpa) as thermal source.Ammonium nitrate solution 24 after concentrating returns neutralized system, and the qualified phlegma 18 after the processing is sent system by pump 17.Two imitate flash steam 12 enters condenser 27 systems generation cleaned condensate and keeps system's negative pressure (0.02 ~ 0.05Mpa) by injector 29.Make the energy saving of system consumption reduction by regulating an effect flash steam 14 pressure.

Embodiment 2:

Fig. 2 shows and utilizes vapor recompression processing technological flow synoptic diagram, among the figure, the treatment unit of ammonium nitrate wastewater contains single-effect evaporation recompression treatment facility: this device comprises neutralization buffer groove 4, single-effect evaporation equipment, mechanically compress treatment facility, the phlegma storage tank 16 that links to each other successively, evaporation equipment comprises vaporizer 7, separator 8, recycle pump 10, the mechanically compress treatment facility comprises vapor recompression machine 32, is provided with non-moist fiber mist eliminator 9 in the separator 8 and controls entrainment with steam.

Technological principle to this device is described in more detail in conjunction with the accompanying drawings: referring to Fig. 2, utilize vapor recompression processing technological flow synoptic diagram, do not have can condition for secondary steam that utilizes or live steam expense costliness under, replace multifunctional evaporating equipment 7 ~ 11,19 ~ 23 among Fig. 1 with flash steam recompression equipment 7 ~ 11,32 ~ 33, reasonably reclaiming ammonium nitrate concn is 15 ~ 20%.

Embodiment 3:

Fig. 3 shows and utilizes part secondary steam two to imitate evaporation employing machinery recompression flow process schematic flow sheet simultaneously, among the figure, the treatment unit of ammonium nitrate wastewater contains 2 imitates evaporation equipment and recompression treatment facility: this device comprises the neutralization buffer groove 4 that links to each other successively, multifunctional evaporating equipment, the mechanically compress treatment facility, phlegma storage tank 16, evaporation equipment comprises one, 2nd effect evaporator 7,19, one, two

imitate separator

8,20, one, two imitate recycle pump 10,22, the mechanically compress treatment facility comprises vapor recompression machine 32, separator 8, be equipped with non-moist fiber mist eliminator 9 in 20,21 control entrainment with steam.

Technological principle to this device is described in more detail in conjunction with the accompanying drawings: referring to Fig. 3, utilize the part secondary steam to adopt machinery recompression flow processing process flow diagram simultaneously, the

subsequent disposal unit

27,28,29,30,31 of the steam 12 that vapor seperator produces is imitated at the end with synoptic diagram 1 is replaced by mechanically

compress treatment facility

32,33, and make recompression steam 33 with former enter the end imitate the heating steam 14 of vapo(u)rization system mixes after the operation that is coupled of common thermal source as multi-effect evaporation system last evaporator 7.Need not dispose the vacuum cooling condenser system and avoid using water coolant, when further reducing secondary steam consumption flow process will be simplified greatly, saving is invested and is reduced cost.

Claims

1. the treatment unit of an ammonium nitrate wastewater is characterized in that: comprise in the following scheme any:

2. the treatment unit of ammonium nitrate wastewater according to claim 1, it is characterized in that: described vaporizer all adopts the falling film type evaporation mode.

3. the treatment unit of ammonium nitrate wastewater according to claim 1, it is characterized in that: described separator is equipped with non-moist fiber mist eliminator and controls entrainment with steam.